I don't pretend (that) I know much about the subject, but...

我不敢说自己对这个主题有多了解，但是…

《牛津词典》

We don't know much about it.

我们对此了解不多。

youdao

Sorry, I don't know much about wine.

对不起，我对葡萄酒不太了解。

youdao

why,when we do not sleep, we do not function well. We just do not know much about sleep at all."

VOA: special.2009.08.26

you know, pretty much just kind of traveling out everywhere, I've seen just tons of people doing different things, and

尤其是你走过不同的地方，你会看到不同的人做着不一样的事情，

街头艺术 - SpeakingMax英语口语达人

These are very interesting results, but sort of the bias that everything should be done with white males that existed for many years hid some of these really interesting and important interactions that otherwise people didn't know much about.

这都是些值得关注的结果,但多年来对白人男性的研究带来的偏见,掩盖了这些有趣而重要的相互关系,人们对此知道得不多

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Take the oceans, about which we know much less than the dark side of the moon.

CNN: Mars can wait. Oceans can't

He didn't know much about entertainment or the fountain drink biz, but he knew Arnold.

FORBES: Pop Music

His boss was a red wine drinker, though Joe didn't know much more than that.

WSJ: Houseguest Wine: Yes to Albari?o, No to Malbec | On Wine by Lettie Teague